Heat interchanger



Aug. 14. 1928.

C. V. BOYS HEAT INTERCHANGER Filed Oct. 24, 1924 Patented Aug. 14, 1928.

. UNITED STATES PATENT OFFICE.

HEAT INTERCHYANGER.

. Application filed October 24, 1924, Serial No. 745,719, and in GreatBritain January 3, 1922.

My invention relates to'heat inter-changers and has forits object toprovide improved constructions which are particularly applicable to theinstrument described in my prior application Serial No. 440,453.

Referring to the accompanying dlagrammatic drawings Figure 1 representsa vertical sectional view of a convenient construction in accordancewith the present. invention,

Figure 2 is a plan View partly in sect on on the line 2-2 of Figure 1correspond ng thereto, and Figure 3 is an inverted section on the line33 of Figure 1.

In carrying the invention into effect in one form by way of example asindicated in Figures 1 and 2, the heat interchanger 1s made of sheetmetal (preferably of lead) autogenously soldered for continuouslyrecording Calorimeters, but other metals such as copper or brass softsoldered might be used for instruments not in continuous use. Leadautogenously soldered is well known to resist the destructive action ofthe sulphurous vapours of burning gas and sois preferable moreespecially for continuous use.

It will be evident that other material than metal which can be made intosheets and joined and which is sufliciently heat-conduct ing andincorrodible might be used for the interchanger.

The heat interchanger is formed of sheet metal bent or folded so as tocontain numerous narrow up passages a, b, c, d, for the circulatingwater and a voluminous up passage ac and down passages e for the gasesof combustion.

In Figure 2 the metal of the heat interchanger is shown as part of asingle strip of thin sheet metal bent backwards and forwards radially soas to enclose the narrow waterways a between its own folds and to forman additional waterway 6'' between these and the casing f in which theinterchanger is contained. At the upper and lower ends of said heatinterchanger the radial waterways (l and 0 respectively are somewhatwidened as indicated so that there may be a sufficient water circulationup the inner folds of the metal. These inner folds are arranged to be incontact (Figure 2) or nearly so, in order that the ascending gases inpassage w and the descending gases in passages e maynot intermix, andany accidental chinks left between these will in upwards and outwards inthe numerous narrow passages betwen the bent-in portions as indicated bythe arrows on the right of the centre of Figure 1.

The int-crchanger is shown as contained within a cylindrical casing f towhich a flange q is permanently secured. The

flange it is clamped to this flange q in a watertight manner through theintermediary of a washer r and clamping screws 8. lVater is admittedthrough the conduit 27 whence it circulates around the annulus u.

Three or more of the radial webs are carried higher than the rest toform supports 7:. These supports serve to carry a flat dome of fusedsilica or equivalent material m which in use becomes hot enough toprevent water from condensing upon it, and as it is incorrodible,pimples of corroded metal 1mmediately above the flame cannot be formed.

Where these hot gases impinge directly upon water cooled metal,condensation of vapour occurs and if the metal corrodes and forms apimple the condensed vapour drops upon the burner 10 and puts out theflame.

Immediately above the silica dome m a metal dome or cap n is providedand this is soldered all round as shown at 0 to the bent-1n portionsaforesald, and thus the hot gases are able to move outwards anddownwards as indicated by the arrows on the left of the centre of Figure1 and the Water is able to move upwards, but is not able to enter intothe. passages for the gases.

As will be seen at p, Figure 2, the two ends of the strip of sheet metalare bent inwards into one of the down gas passages and there solderedtogether.

By the construction described above I am able to obtain a heatinterchanger of great simplicity and cheapness of construction with avery large surface for the cooling of the gases so that it may be madecompact and it is durable if made of lead.

1; A. heat interehanger including a sheet of metal folded alternatelyinwardly and outwardly, so as to form a separating wall between acentral uptake, a plurality of downcomers and a plurality of uptakes,

' means establishing communication between the said central'uptake andplurality of downcomers whereby said uptake and downcomers constitute:oneconduit system while the said plurality of uptakes constitute aseparate conduit system.

2. A heat inter-changer including a sheet of metal folded alternatelyinwardly and outwardly, so as to form a separating wall between acentral uptake, a plurality of downcomers and a plurality of uptakes,means establishing communication between the said central uptake andplurality of downcomers whereby said uptake and downcomers constituteone conduit system, while the said pllu'ality of uptakes constitute aseparate conduitsystem, a roof and an incorrodible element having aconcave lower surface disposed beneath and out of contact with saidroof.

In testnnonywhereof Ihave signed my 4 name to this specification. v

f CI-IARLESVICRNUN BOYS;

